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Which structure of the nervous system carries action potential in the direction of a synapse?

A axon

Axons carry action potential in the direction of synapses. Axons are the long, fiberlike structures that carry information from neurons. Electrical impulses travel along the body of the axons, some of which are up to a foot long. A neuron is a type of cell that is responsible for sending information throughout the body. There are several types of neurons, including muscle neurons, which respond to instructions for movement; sensory neurons, which transmit information about the external world; and interneurons, which relay messages between neurons. Myelin is a fat that coats the nerves and ensures the accurate transmission of information in the nervous system.